Effect of water-soluble reduced chitosan on Streptococcus mutans, plaque regrowth and biofilm vitality

  • K. Bae
  • E. J. Jun
  • S. M. Lee
  • D. I. Paik
  • J. B. Kim
Original Article

Abstract

The purpose of the present study was to examine the effects of a newly developed water-soluble reduced chitosan on Streptococcus mutans, plaque regrowth, and biofilm vitality. A 1.0%, water-soluble reduced chitosan, with pH ranging from 6.0 to 6.5, molecular weights between 3,000 and 5,000 Da, and 70% degree of deacetylation, was used. To determine antibacterial and antiplaque potency of chitosan, minimal inhibitory concentrations (MICs) for S. mutansand S. sanguinis (formerly S. sanguis), short-term exposure to S. mutans, and clinical trial of plaque regrowth and biofilm vitality were conducted. Twelve dental students volunteered to participate in the 6-week, double blind, randomized clinical trial using the classical 4-day plaque regrowth design. The MIC of water-soluble reduced chitosan for S. mutans was 1.25 g/l. While the cells exposed to distilled water (DW) grew rapidly, with a maximum turbidity reached by 16 h postinoculation, S. mutans exposed to chitosan (5.0 g/l) exhibited a substantial delay in growth and reached a maximum turbidity by 32 h postinoculation. The chitosan solution reduced the plaque index and the vitality of the plaque flora significantly when compared to DW, but this was less than the reductions found with the positive control of 0.1% chlorhexidine solution. The water-soluble reduced chitosan exhibited potent antibacterial effect on S. mutans, and displayed a significant antibacterial and plaque-reducing action during the 4-day plaque regrowth.

Keywords

Water-soluble reduced chitosan Streptococcus mutans Plaque regrowth Biofilm vitality Minimal inhibitory concentrations 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • K. Bae
    • 1
  • E. J. Jun
    • 1
  • S. M. Lee
    • 1
  • D. I. Paik
    • 2
  • J. B. Kim
    • 1
  1. 1.Department of Preventive and Community Dentistry, College of DentistryPusan National UniversitySo-guSouth Korea
  2. 2.Department of Preventive and Public Health Dentistry, College of DentistrySeoul National UniversityChongro-guSouth Korea

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